Shure FP42 User manual

Brand: Shure

Model: FP42

Category: Musical Equipment

Type: User manual

This manual is also suitable for

Model FP42

GENERAL

The FP42 is a 4-input, 2-output, compact, self-contained stereo

mixer for applications in broadcasting, recording and sound rein-

forcement. The high-reliability FP42 integrates all the operating

features of a professional stereo mixer in a single unit—small and

lightweight enough for location use, but with the reliability of a stu -

dio console.

FEATURES

S Wide, flat frequency response, low distortion, and high

output level

S Reliable operation under all temperature and humidity

conditions

S Protected against RF interference and damage from input

overload and shorted outputs

S Four transformer-coupled XLR inputs, each microphone -line

switchable with low-cut filters and cuing function

S Full-separation pan pots with center detent on each input for

precise spatial positioning

S Phantom power for condenser microphone operation

S Built-in tone oscillator permits level checking and line testing

S Left- and right-channel transformer-coupled XLR outputs,

with microphone-line and mono-stereo s witches

S Parallel stereo headphone jacks (1/4-inch and mini) with

level control

S Left and right mix bus jacks

S Active, feedback-type input gain controls for high-level input

signals without input attenuators

S Adjustable-threshold limiter with left - and right-channel peak

indicators

S VU meters with range switch and battery check function

S Left- and right-channel master level controls and ganged

headphone level c ontrol

S Powered by ac (120 or 240V—internally selectable) or

built-in battery pack

S Low battery drain provides up to 10 hours operation under

normal conditions

S Noiseless and automatic switchover to and from battery

power

S Rugged, durable construction

S Compact and lightweight for field use and transporting

S Rack-mountable with accessory rack mount kit

S Listed by Underwriters Laboratories, Inc.;

listed by Canadian Standards Association as Certified

CONTROLS AND CONNECTIONS

Power Off/On Switch: applies power to the FP42 circuitry.

Channel Level/Cue Rotary Controls: adjust individual input

channel signal levels. Each channel can becued by pulling the con-

trol knob outward, rotating the knob to the desired level, and push-

ing the knob inward to activate the channel.

Lo Cut Filter Slide Switches: reduce unwanted low-frequency

signals such as wind noise by 6 dB per octave at 150 Hz.

Pan L--R Rotary Controls: assign each input channel signal to the

left (L) or right (R) output channel, or equally to each output channel

(center detent).

Master Rotary Control: determines mixed output level at left (L)

and right (R) output connectors. The control is “clutched”: both

channel levels can be set simultaneously, or the left (inner knob) or

right (outer knob) channel can be set individually. The control also

sets the tone oscillator level when the Tone Osc switch is turned on.

Mono/Stereo Slide Switch: selects either monophonic output sig-

nals (both left and right output connectors carry the same signal) or

stereo operation (input channel signals are assigned to left or right

output channels depending on Pan control positions).

Limiter In/Out Slide Switch: activates fast-acting, peak-respond-

ing limiter circuit to cut overload distortion during loud program in-

tervals without affecting normal program levels.

Peak/Limiter LEDS: indicate limiter operation with the limiter in,

and indicate approaching program overload with the limiter out.

The LEDs are activated by the shortest transient peak, but remain

on long enough to provide easy recognition.

L and R VU Meters: indicate 0 VU with a +4 dBm output (recom-

mended for normal use to provide approximately 14 dB headroom

from operating level to clipping level). Rear-panel VU Range +4/+8

slide switch permits changing to 0 VU = +8 dBm. The VU meters are

lit during ac operation only; therefore, the illumination serves as a

visual alarm if the ac is interrupted and the unit has automatically

switched to battery operation.

Batt Check Momentary Push-button Switch: operates in con-

junction with the left-channel VU meter to indicate battery condi-

tion. With the Power switch on and the switch depressed, a new set

of batteries will give about a +2 VU indication. Battery condition is

good if the reading is above 0 VU: a lower reading means that new

batteries are required for proper operation.

Tone Osc Off/On Slide Switch: provides a highly stable, low-dis-

tortion 1-kilohertz tone for line tests and level checks. The tone sig-

nal level is controlled by the Master Level control. The tone signal

appears on both the line and microphone outputs, as well as the

Headphones and Mix Bus connectors. The tone oscillator should

be switched off when not in use.

Headphones 1/4-inch Stereo Phone Jack and Miniature 3.5

mm Stereo Phone Jack: permit monitoring mixer output through

most stereo headphones. The Headphones rotary control adjusts

Model FP42 User Guide

Stereo Microphone Mixer

27A8795 (CD)

ã2003, Shure Incorporated

PrintedinU.S.A.

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the output level of both left and right channels. Note that the head-

phones output level is high enough for use as an auxiliary unbal-

anced line feed to drive a tape deck or a power amplifier.

Input 1–4 XLR Connectors: are balanced, professional, three-pin

audio connectors. Pins 2 and 3 are “hot,” and pin 1 is ground. For

microphone operation, the Input Mic/Line switches must be in the

Mic position; for line level inputs, the switches must be in the Line

position. Phantom Off/On Slide Switch: controls the application of

phantom power for condenser microphones to all inputs. With the

switch on and Input Mic/Line switches in the Mic position, +30 Vdc

is applied to pins 2 and 3 of each input connector. Series current-

limiting resistance is 3.3 kilohms for each input. When using other

than Shure condenser microphones, verify that the voltage and re-

sistance requirements are compatible.

Output L and R XLR Connectors: are professional, three-pin au-

dio connectors for connection to either low-impedance microphone

or line-level inputs of power amplifiers, mixers, or other signal-proc-

essing equipment. The Output Mic/Line switch selects either mi-

crophone- or line-level output signals.

Mix Bus L and R Phono Pin Jacks: provide direct access to the

left and right output channel mixing buses. This facilitates stacking

or “multing” FP42s to achieve additional input capacity without los-

ing any inputs. With two FP42s connected at their mix bus jacks, for

example, the left and right mix buses of each unit are directly con-

nected, providing two independent (ganged) master gain controls

and two isolated line amplifiers with eight individually controlled in-

puts. Since the buses are directly connected, a 6 db drop in the gain

of each output channel will occur, and the master or input controls

must be increased to compensate.

INSTALLATION AND OPERATION

Battery Operation

In addition to 120- or 240-volt ac operation, the FP42 can be oper-

ated from an internal battery pack. Current drain is typically 32 mA

at + 4 dBm output level. Battery operation is recommended for re-

mote, on-location operation, and as an emergency backup source

in case of ac power failure.

Access to the battery compartment is through the bottom of the

chassis. Three 9-volt transistor radio batteries power the FP42 at

full rated output. Use alkaline batteries for maximum life. Battery life

is approximately 10 hours at +4 dBm continuous use. Note that

phantom power loading will increase battery drain.

With batteries in the battery compartment, the FP42 will automati-

cally and silently switch to battery operation should the ac voltage

fall below a suitable level.

Battery condition can be determined by using the Batt Check switch

on the front panel. With the FP42 power switch on, activate the Batt

Check switch, and observe the VU meter. A new set of batteries will

give about a +2 VU indication. Battery condition is good if the read-

ing is above 0 VU; a lower reading means that new batteries are

required for proper operation. (Note that the FP42 power switch

must be turned on to check battery condition.)

Connections

Connect the signal sources to the three-socket XLR Input connec-

tors and set the Mic/Line switches for the proper level. Connect the

three-pin XLR Output L and R connectors to low-impedance micro-

phone or line-level inputs of power amplifiers, mixers, VTRs, etc.

Set the Output Mic/Line switch for the appropriate signal level.

If desired, connect additional FP42s or other mixers using the Mix

Bus phono pin jacks. A common ground connection can be estab-

lished using the rear-panel Ground binding post.

Connect the line cord to a 120 Vac +10%, 50/60 Hz source if the

FP42 is to be ac-operated. If 240-volt ac operation is desired, refer

to the Service section.

Adjustments

Turn the Power switch to the On position (VU meters will light in ac

operation). Turn the Phantom switch on if non-battery-operated

condenser microphones are to be used with the FP42. (Caution: Do

not turn the Phantom switch on when using unbalanced low-imped-

ance microphones; objectionable hum will result.) Note that phan-

tom power cannot be applied to the inputs with the Mic/Line

switches in the Line position; if line-level condenser microphones

(such as Shure’s SM82) are to be operated on phantom power,

contact Shure’s Customer Services Department for modification in-

structions.

Turn the Limiter switch to Out. For each input channel, apply an in-

put signal and rotate the associated Pan control to assign the signal

to the left or right output channel as desired. Adjust the Channel

Level control for each channel so that the VU meter needles move

with the audio signals in the 0 VU to –20 VU range, with occasional

movement into the 0 VU to +3 VU (red) area. With the limiter out, the

red Peak/Limiter LEDs will flicker as the signal level approaches

clipping.

If desired, activate the Lo Cut Filter switches above the Channel

Level controls. The filter action will help reduce wind noise and un-

desirable low-frequency signals such as from condenser micro-

phones or turntable rumble (see Figure 1).

LO-CUT FILTER ACTION

FIGURE 1

Note that each input Channel Level control has a cuing capability.

To cue a channel while the other channels are carrying program

material, pull the desired channel Level control outward to the cue

position. This removes that channel from the mixing circuitry and

routes it only to the Headphones jacks. Adjust the Headphones lev-

el control to a comfortable listening level, and adjust the cued chan-

nel Level control for a proper mixing level. Restore the cued signal

to the program mix by pushing the Channel Level control inward.

The limiter circuit is activated by the Limiter switch. With the switch

set to In, mixer output is limited to the preset threshold level of +14

dBm. Increasing the Channel Level or Master gain controls in-

creases the average output and the amount of limiting. To adjust the

limiter threshold, refer to the Service section.

With the limiter circuit in, the Peak/Limiter LEDs light to show limiter

action. The LEDs respond much faster than VU meters and are ac-

tivated by extremely short transient peaks, but remain on long

enough for easy recognition.

VU Meter

The VU meters are factory-calibrated for use with a 600-ohm termi-

nated line. The VU Range switch on the rear panel selects either a

+4 or +8 dBm output at 0 VU meter indication. (This switch changes

the meter indication but does not change the actual output level.)

Microphone output levels are 50 dB below line output. The +4 range

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is recommended for normal use to provide approximately 14 dB of

headroom from operating level to clipping level.

The VU meters are illuminated by a single cartridge-type, 6.3V in-

candescent lamp, operating well under its normal rating for a life ex-

pectancy of greater than 10,000 hours. The lamp is only lit for ac

operation. Consequently, the illumination serves as a visual alarm if

the ac is interrupted and the unit has switched to battery operation.

The VU meters are connected on the primary side of the output

transformer to assure protection from any dc level on a telephone

line.

Telephone interconnection

When using the FP42 connected directly to a telephone line, check

to see whether the telephone company requires an interface cou-

pler between the FP42 and the telephone line. If a coupler is re-

quired, make certain the coupler selected and the wiring arrange-

ment are in compliance with local telephone company regulations.

Connect the telephone line to the left or right Output connector and

turn the Pan controls so that the entire output signal is on the tele-

phone-connected output, or switch to mono operation.

Telephone Line Surge Protection

When using the FP42 connected directly to a telephone line subject

to lightning-induced voltage surges, the following part (commer-

cially available) can be installed across the output terminals to pro-

vide additional protection for output circuit components: Metal Ox-

ide Varistor, General Electric Co., Type No. V22ZA1.

SPECIFICATIONS

Frequency Response (ref 1 kHz)

30 to 20,000 Hz, +1, –3 dB

Voltage Gain (at 1 kHz)

OUTPUT

INPUT

LINE MICROPHONE MIX BUS PHONES PHONES (CUE)

Mic 90 dB 40 dB 25 dB 100 dB 85 dB

Line 40 dB –10 dB –25 dB 50 dB 35 dB

Mix Bus 55 dB 5 dB – 62 dB –

Inputs

IMPEDANCE (at 1 kHz)

INPUT CLIPPING LEVEL

INPUT

FOR USE WITH ACTUAL

INPUT CLIPPING LEVEL

(at 1 kHz)

Mic 19–600 ohms 1k –40 to –5 dBV*

Line Less than 10k 66k +10 to +45 dBV*

Mix Bus 3.5k 3.5k 0 dBV

*Dependent on input control setting.

Outputs

IMPEDANCE (at 1 kHz)

OUTPUT CLIPPING LEVEL

OUTPUT

FOR USE WITH ACTUAL

OUTPUT CLIPPING LEVEL

(at 1 kHz)

Mic 150 ohms <1 ohm

–33 dBV min. across150

ohms

Line 600 ohms 185 ohms

+18 dBm min. across 600

ohms

Mix Bus 3.5k 3.5k –15 dBV min. across 3.5k

Headphones 8–2000 ohms 100 ohms +6 dBV min. across 200 ohms

Noise

Equivalent Input Noise: –129 dBV (low-impedance micro-

phone, 150 ohms, 300 to 20,000 Hz) into 600-ohm load at full

gain

Equivalent Input Hum and Noise: –127 dBV (low-impedance

microphone, 150 ohms, 20 to 20,000 Hz) into 600-ohm load at

full gain

Output Noise: –70 dBV maximum (output control full counter-

clockwise [off]), –55 dBV maximum (output control full clockwise

[on]) (input control down, 300 to 20,000 Hz)

Output Hum and Noise: –62 dBV maximum (output control

down), – 53 dBV max. (output control up, input control down, 20

to 20,000 Hz)

Distortion

0.4% or less THD, 30 to 20,000 Hz at + 15 dBm output; 0.5% or

less IM distortion at +15 dBm output into 600 ohms

Common Mode Rejection

65 dB minimum with input of – 20 dBV at 100 Hz

Control Interaction

Less than 1 dB with any control combination

Overload and Shorting Protection

Shorting outputs, even for prolonged periods, will cause no dam-

age; microphone input will not be damaged by signals up to 3V

Separation (left and right outputs)

40 dB minimum at 10 kHz; 50 dB minimum at 1 kHz

Low-Cut Filters

6 dB per octave rolloff at 150 Hz

Limiter

Threshold: Adjustable, +8 to +14 dBm

Attack Time: 3 msec typical

Recovery Time: 500 msec typical

Peak/Limiter Indicators

Limiter out: lights 6 dB below clipping

Limiter in: lights at onset of limiter action

Phase

All outputs in phase with all inputs. Pin 2 is “high” with respect to

pin 3; pin 1 is ground. Tip of mix bus jack in phase with pin 3. Tip

and ring of headphone jacks in phase with pin 2 of left and right

outputs, respectively.

Tone Oscillator

1 kHz; +18 dBm maximum at both outputs with Master level full

Phantom Power

30 Vdc nominal, 3.3k series resistance, automatically disabled

with input switch in Line position

Operating Voltage

Ac Operation: 120 or 240 Vac ±10% (internally selectable),

50/60 Hz, 6W

Dc Operation: 27 Vdc nominal at 30 mA typical no-signal, 32 mA

typical at 0 VU (+4 dBm) output; 21.5 Vdc minimum; battery life

approximately 10 hours with alkaline batteries at +4 dBm output

in continuous use; three 9-volt batteries, type NEDA 1604A

Temperature Range

Operating: –18° to 57° C (0° to 135° F)

Storage: –29° to 71° C (–20° to 160° F)

Dimensions

79.5 mm H x 310 mm W x 230 mm D

(3–1/8 in. x 12–7/32 in. x 9–1/16 in.)

Weight

Net: 2.95 kg (6 lb 8 oz)

Packaged: 3.45 kg (7 lb 10 oz)

Certifications

Listed by Underwriters Laboratories, Inc.; listed by Canadian

Standards Association as Certified

ACCESSORIES

The Model A16R Rack Panel Kit consists of a 19 in. x 3–1/2 in.

(483 mm x 89 mm) precut rack panel and necessary hardware for

rack-mounting the FP42 with its cover in place and end caps re-

moved in a standard 19” (483 mm) rack panel.

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Shure FP42 User manual

Brand: Shure

Model: FP42

Category: Musical Equipment

Type: User manual

This manual is also suitable for

Model FP42

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Shure FP42 User manual

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Shure FP42 User manual

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